!   $Id: 5427,v 5.1 1994/07/27 17:50:13 pepsa Exp $

coverpage:

  title_1:         CALIBRATION OF NEARBY GALAXY TYPE IA SUPERNOVAE AS STANDARD
    title_2:       CANDLES: NGC4496 AND NGC4356 - CYCLE4MEDIUM
    sci_cat:       GALAXIES & CLUSTERS
    sci_subcat:    DISTANCE SCALE
    proposal_for:  GO
    pi_fname:      ALLAN
    pi_mi:         R
    pi_lname:      SANDAGE
    pi_inst:       OBSERVATORIES OF THE CIW
    pi_country:    USA
    pi_phone:      818-304-0246
    hours_pri:     40.10
    num_pri:       2
    wf_pc:         Y
    time_crit:     Y
    off_fname:     RICHARD
    off_lname:     BLACK
    off_inst:      3030
    off_addr_1:    OCIW
    off_addr_2:    813 SANTA BARBARA STREET
    off_city:      PASADENA
    off_state:     CA
    off_zip:       91101
    off_country:   USA
    off_phone:     818 577 1122
! end of coverpage

abstract:

    line_1:        We propose to proceed to the next step in the program to determine Cephe
    line_2:        distances to relatively nearby resolved galaxies that have produced
    line_3:        type Ia supernovae (SNeIa). The feasibility of the program has been shown
    line_4:        by our results for IC4182, where 27 Cepheids were found and used to show
    line_5:        that V(max)=-19.76 for SNIa 1937C. Since present evidence indicates that
    line_6:        SNeIa are good standard candles, such determinations calibrate the
    line_7:        Hubble diagram for SNeIa at sufficiently large distances where streaming
    line_8:        relative to the Hubble flow are negligible. From the results of SN1937C,
    line_9:        have estimated H0=52+/-9 km/s/Mpc, where the uncertainty comes almost en
    line_10:       from calibrating only 1 SNIa. Calibration of additional SNeIa are requi
    line_11:       to determine the scatter in absolute magnitude to directly examine
    line_12:       their worth as standard candles. If the indication from other evidence
    line_13:       confirmed, H0 will be determined to within 10 percent from the same dat
    line_14:       NGC 5253 (the host of SNeIa 1895B and 1972E) is
    line_15:       slated for observation with HST in Cycle 3. All other suitable galaxies
    line_16:       larger distances where the Cepheids can be found only with a refurbishe
    line_17:       We therefore propose to observe NGC 4496 and NGC 4356, hosts of the well
    line_18:       observed SNeIa 1960F and 1981B respectively, to find Cepheids, determine
    line_19:       distance, and hence the peak absolute magnitudes of the SNIa produced
    line_20:       in them.

!
! end of abstract

general_form_proposers:

  lname:           SANDAGE
    fname:         ALLAN
    inst:          3030
    country:       USA

!

  lname:           PANAGIA
    fname:         NINO
    inst:          3470
    country:       USA
    esa:           Y

!

  lname:           MACCHETTO
    fname:         F
    inst:          3470
    country:       USA
    esa:           Y

!

  lname:           TAMMANN
    fname:         GUSTAV
    inst:          7860
    country:       SWITZERLAND
    esa:           Y

!

  lname:           SAHA
    fname:         ABHIJIT
    inst:          3470
    country:       USA

!

  lname:           LABHARDT
    fname:         LUKAS
    inst:          7860
    country:       SWITZERLAND
    esa:           Y

!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       1
    line_1:        Observations will be carried with WFPC2. Properly time spaced exposures
    line_2:        spanning a period of 2 months (as much permitted by the range of off-
    line_3:        nominal roll at the same ORIENT) in the V band (F555W) will be required.
    line_4:        In particular, we aim to obtain a sequence that has 6 images in the V
    line_5:        band spaced by 40 hours (5/3 days), 5 images spaced at 120 hours (15/3
    line_6:        days) and 5 more taken at spacings of 40/3 days. These are spacings are
    line_7:        nested in an optimum order to sample all periods from 9 to 60 days at
    line_8:        least once for each 1/8 phase interval. Some I band (F814M) are to be
    line_9:        taken at selected epochs to allow computation of <I>, in order to probe
    line_10:       questions of reddening.
    line_12:       We expect to obtain S/N of 10 or better at V of 27.5. We estimate that
    line_13:       after INCLUDING the object confusion effects (these galaxies are at the
    line_14:       Virgo distance), exposures of 4200s are required. This will allow us to
    line_15:       obtain adequate light curves of Cepheids with period 10 days or more.
    line_17:       The roll angle of the telescope should remain the same throughout the
    line_18:       sequence of observations on a given target. The time of year that
    line_19:       permits the maximum period of observation at a fixed roll angle should
    line_20:       be chosen, and the entire sequence of observations scheduled. The first
    line_21:       observation will have to be at extreme off-nominal roll, going through
    line_22:       nominal roll to the other extreme, as the nominal roll changes over
    line_23:       2 months while ORIENT is held fixed.

!

  question:        3
    section:       2
    line_1:        In the exposure logsheet, dates and ORIENT angles when the scheme should
    line_2:        be possible are indicated. The two objects are very close together in
    line_3:        the sky, and these windows are essentially identical. Since the timing
    line_4:        requirements and exposures are almost identical with only one exception,
    line_5:        it may be expeditious to plan observations of these targets in tandem.
    line_7:        Please consult the contact person during proposal implementation to
    line_8:        if questions arise while optimizing the scheduling.

!

  question:        4
    section:       1
    line_1:        The problem of the determination of distances by using Cepheids has been
    line_2:        recognized as one of the key programs for HST. Work with ground based
    line_3:        telescopes has proceeded as far as it can. However, seeing limitations
    line_4:        make it impossible to carry out a program such as this from the ground
    line_5:        because of crowding and/or limiting magnitude problems. The WFPC2 is
    line_6:        the best of the HST instruments for this project because of its wide
    line_7:        field and good V and I sensitivity.

!

  question:        5
    section:       1
    line_1:        Observations must be conducted at planned time intervals to ensure
    line_2:        adequate coverage of the Cepheid light curves. Once the sequence of
    line_3:        exposures on a target is begun, the schedule must be adhered to as
    line_4:        well as possible. This has been very well done in Cycle 1 and 3 for
    line_5:        similar observations.
    line_7:        It is highly desirable (all but absolutely essential) to keep the field
    line_8:        orientation the same over the observing period. The natural telescope
    line_9:        roll angle for a given target changes with observation epoch. Hence the
    line_10:       observations should be made during that time of year when the maximum
    line_11:       time span is available for legal off-nominal roll angles, so that
    line_12:       the field orientation is kept the same, while observing over the
    line_13:       maximum span of dates. Such accomodation was possible in Cycle 1 and 3
    line_14:       for similar observations. If forced to allow changes in orientation,
    line_15:       field coverage will be severely compromised. It may be necessary to
    line_16:       adjust exposure times to fit the visibility periods at times of year
    line_17:       where the SAME ORIENT constraint drives the scheduling. Please consult
    line_18:       with the contact person.

!

  question:        6
    section:       1
    line_1:        None

!


!

  question:        8
    section:       1
    line_1:

!

  question:        9
    section:       1
    line_1:        The similar study of Cepheids in IC 4182 and the calibration of
    line_2:        the peak brightness of SN1937C has been completed, an is in press. The
    line_3:        data were taken in Cycle 1.
    line_5:        Cepheids have been found from the Cycle 3 observations of NGC 5253, and
    line_6:        analysis is in progress. A letter to ApJ is expected by end October '93,
    line_7:        and a full analysis paper by summer of 94.

!

  question:        10
    section:       1
    line_1:        A. Sandage will have access to the computing facilities set up in
    line_2:        Pasadena for the program GO-2547 on IC 4182, in addition to salary
    line_3:        support from Carnegie and some travel expenses also from Carnegie.
    line_4:        The ground based observations needed to calibrate the HST observations
    line_5:        will be obtained using the telescope facilities of the Observatories
    line_6:        of the Carnegie Institution of Washington.
    line_8:        F.D. Macchetto and N. Panagia will have access to ESA travel funds.
    line_10:       G. Tammann and L. Labhardt will have access computing and image
    line_11:       processing facilities at the University of Basel, and to financial
    line_12:       support from the Swiss National Science Foundation.
    line_14:       A. Saha has access to computing facilities at STScI, and is seeking
    line_15:       minor hardware upgrades (data storage space) from a grant from this
    line_16:       proposal. A post-doctoral fellow to assist in the data reduction and
    line_17:       analysis is also sought from a grant to this program.

!
!end of general form text

general_form_address:

  lname:           SANDAGE
    fname:         ALLAN
    category:      PI
    inst:          3030
    addr_1:        OCIW
    addr_2:        813 Santa Barbara Street
    city:          PASADENA
    state:         CA
    zip:           91106
    country:       USA
    phone:         818-304-0246

!

  lname:           SAHA
    fname:         ABHIJIT
    category:      CON
    inst:          3470
    addr_1:        STSCI
    addr_2:        3700 SAN MARTIN DRIVE
    city:          BALTIMORE
    state:         MD
    zip:           21218
    country:       USA
    phone:         410 338 4806

!
! end of general_form_address records

fixed_targets:

    targnum:       1
    name_1:        NGC4496A-FIELD
    descr_1:       E,301
    pos_1:         RA = 12H 29M 6.3S  +/- 0.07S,
    pos_2:         DEC = +04D 12' 54.0" +/- 1"
    equinox:       1950
    comment_1:     FIELD CENTERED ON SBC GALAXY
    comment_2:     FOR CEPHEID SEARCH
    comment_3:     GALAXY HOSTED TYPE IA SN1960F
    fluxnum_1:     11
    fluxval_1:     V=27.5
    fluxnum_2:     11
    fluxval_2:     B-V=0.6

!

    targnum:       2
    name_1:        NGC4536-FIELD
    descr_1:       E,301
    pos_1:         RA = 12H 34M 21.0S  +/- 0.07S,
    pos_2:         DEC = +02D 12' 20.0" +/- 1",
    pos_3:         PLATE-ID=01UQ
    equinox:       2000
    comment_1:     FIELD 1' S AND 1' E OF CENTER
    comment_2:     FOR CEPHEID SEARCH
    comment_3:     GALAXY HOSTED TYPE IA SN1981B
    fluxnum_1:     12
    fluxval_1:     V=27.5
    fluxnum_2:     12
    fluxval_2:     B-V=0.6

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         POS TARG +10, +10;
    req_3:         AT 10-MAY-94 +/- 30D;
    req_4:         ORIENT 112D +/- 5D
    comment_1:     THE CHOSEN ORIENT IS NOMINAL ON 13-JUL
    comment_2:     THIS ORIENT CAN BE USED FROM 9-APR
    comment_3:     THROUGH 8-AUG, SO THE SEQUENCE SHOULD
    comment_4:     BEGIN AND END BETWEEN THESE DATES.
    comment_5:     ALTERNATELY CAN CHOOSE AT 1-JAN-95
    comment_6:     WITH ORIENT 290D

!

    linenum:       2.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         SAME ORIENT FOR 2-17 AS 1;
    req_3:         SAME POS FOR 2-17 AS 1;
    req_4:         AFTER 1 BY 10D +/- 1D
    comment_1:     .... CONTD FROM LINE 1...
    comment_2:     WHICH IS NOMINAL ON 31-JAN -- THIS IS
    comment_3:     A MUCH TIGHTER FIT THAN APRIL-AUG
    comment_4:     ALTERNATIVELY WAIT TILL APR-AUG 1995.
    comment_6:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       2.500
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F814W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         GROUP 2-2.5 NO GAP
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       3.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 15D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       4.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 20D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       5.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 22D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       6.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 25D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       6.500
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F814W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         GROUP 6-6.5 NO GAP
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       7.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 27D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       8.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 30D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       9.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 33D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       10.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 35D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       11.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 38D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       12.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 40D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       12.500
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F814W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         GROUP 12-12.5 NO GAP
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       13.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 45D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       14.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
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    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 50D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       14.500
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F814W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         GROUP 14-14.5 NO GAP
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       15.000
    targname:      NGC4496A-FIELD
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    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 55D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       16.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 60D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       17.000
    targname:      NGC4496A-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     11
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 1 BY 67D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       101.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         POS TARG +10, +10;
    req_3:         AT 10-MAY-94 +/- 30D;
    req_4:         ORIENT 112D +/- 5D
    comment_1:     THE CHOSEN ORIENT IS NOMINAL ON 13-JUL
    comment_2:     THIS ORIENT CAN BE USED FROM 9-APR
    comment_3:     THROUGH 8-AUG, SO THE SEQUENCE SHOULD
    comment_4:     BEGIN AND END BETWEEN THESE DATES.
    comment_5:     ALTERNATELY CAN CHOOSE AT 1-JAN-95
    comment_6:     WITH ORIENT 290D

!

    linenum:       102.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         SAME ORIENT FOR 102-117 AS 101;
    req_3:         SAME POS FOR 102-117 AS 101;
    req_4:         AFTER 101 BY 10D +/- 1D
    comment_1:     .... CONTD FROM LINE 1...
    comment_2:     WHICH IS NOMINAL ON 31-JAN -- THIS IS
    comment_3:     A MUCH TIGHTER FIT THAN APRIL-AUG
    comment_4:     ALTERNATIVELY WAIT TILL APR-AUG 1995.
    comment_6:     ORIENT AND EPOCH LINKED TO LINE 1.

!

    linenum:       102.500
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F814W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         GROUP 102-102.5 NO GAP
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       103.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 15D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       104.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 20D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       105.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 22D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       106.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 25D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       106.500
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F814W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         GROUP 106-106.5 NO GAP
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       107.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 27D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       108.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 30D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       109.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 33D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       110.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 35D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       111.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 38D +/- 12H
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       112.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 40D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       112.500
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F814W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         GROUP 112-112.5 NO GAP
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       113.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 45D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       114.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 50D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       114.500
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F814W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         GROUP 114-114.5 NO GAP
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       115.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 55D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       115.500
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F814W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         GROUP 115-115.5 NO GAP
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       116.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 60D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!

    linenum:       117.000
    targname:      NGC4536-FIELD
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL-FIX
    sp_element:    F555W
    num_exp:       1
    time_per_exp:  4000S
    s_to_n:        10
    fluxnum_1:     12
    priority:      1
    param_1:       CR-SPLIT=0.5
    param_2:       CR-TOLERANCE=0.0
    param_3:       ATD-GAIN=7
    req_1:         CYCLE 4;
    req_2:         AFTER 101 BY 67D +/- 1D
    comment_1:     ORIENT AND EPOCH LINKED TO LINE 101.

!
! end of exposure logsheet

! No scan data records found